I bought these from a National Trust gift shop at the John Constable "Hay Wain" location in Flatford - and was completely disappointed with them. They're chocolate buttons that, when melted into a hot milk, allegedly produce a mug of salted caramel flavour hot chocolate.
They don't.
You get a mug of hot milk with some chocolate melted into it.
Much better off just eating the chocolate buttons straight out of the tin!!!!!! (which is what I ended up doing!)